Volume 11
Issue 4
Agronomy
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume11/issue4/abs-02.html
VARIABILITY OF DAILY TEMPERATURE CONDITIONS IN BARE SOIL PROFILE
Bożena Michalska, Jadwiga Nidzgorska-Lencewicz
Department of Meteorology and Climatology,
West Pomeranian University of Technology in Szczecin, Poland
ABSTRACT
The research covered the results of automatic measurements of bare soil temperature at four standard depths: 5, 10, 20 and 50 cm, recorded every hour (UTC). The data were reported by the weather station located at Lipki in the vicinity of Stargard Szczeciński over 2001–2005. Soil temperature at four depths was described by mean monthly, seasonal and yearly values in the hourly pattern over twenty-four hours. It was found that the highest mean monthly temperature in the bare soil layer up to 10 cm is reached in July, while at the greater depths it is reached in August. The entire bare soil profile down to 50 cm depth reached its lowest temperature in January. A spring change in the thermal stream direction took place in the last decade of March, while the autumn change was observed in the middle of September. The greatest temperature variability was recorded in the soil horizon up to 5 cm from 4:00 to 6:00 p.m. (UTC), particularly in March, while the lowest temperature variability occurred at the depth of 50 cm in August. The greatest bare soil temperature variability was observed in the afternoon in the horizon up to 20 cm, particularly in June and July.
Key words: bare soil, temperature, hourly time pattern.
Bożena Michalska
Department of Meteorology and Climatology,
West Pomeranian University of Technology in Szczecin, Poland
Kazimierza Królewicza 4, 71-550 Szczecin, Poland
email: bozena.michalska@zut.edu.pl
Jadwiga Nidzgorska-Lencewicz
Department of Meteorology and Climatology,
West Pomeranian University of Technology in Szczecin, Poland
Kazimierza Królewicza 4, 71-550 Szczecin
email: jlencewicz@agro.ar.szczecin.pl
Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.